| 摘要 |
PURPOSE:To obtain the titled paper having improved preliminary coloring property and the final coloring density by controlling a layer thickness of a precoat layer, making the sensitized paper to a specific length of flowing down in the titled paper comprising a photosensitive layer and the precoat layer. CONSTITUTION:The precoat layer is formed by coating a substrate with a solution contg., for example, a pigment and a styreneacryl emulsion, etc., thereby preventing to permeate the photosensitive agent into the substrate. The layer thickness is controlled to about 1-3g/cm<2> by making the solution of the precoat layer high viscosity. And the length of flowing down the obtd. sensitized paper is specified to a range of 40-70mm. The length of flowing down the sensitized paper means the length of a range of coloring the sensitized paper, when the sensitized paper to be measured is placed on a glass plate inclined at an angle of 45 deg., followed by dropping a developer on the sensitized paper. And then, the photosensitive layer contg. the diazo compd. is mounted on the precoat layer to obtain the titled paper. Thus, by specifying the length of the flowing down in the sensitized paper, the titled paper having the good preliminary coloring property and the final coloring density is obtd. |
